Tool retainer



Sept. 1 l, 1928.

E. G. GARTIN TOOL RETAINER Filed Dec. 15. 1922 Patented Sept. 11, 1928.

UNITED STATES 1,684,177 PATENT OFFICE.

ELMEB G. GABTIN, OF CLABEMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MA- CHINERY COMPANY, A. CORPORATION OF MASSACHUSETTS.

TOOL RETAINER.

I Application filed December 15, 1922. Serial No. 607,036.

My invention relates to tool retainers.

An object of my invention is to provide an improvedtool retainer. Another object of my invention is to provide an improved rea tainer for rock drilling devices in which the tool retainer maybe conveniently positioned by the means used for holding the tool assembled. These and other objects and advan tages of my invention will hereinafter be more fully apparent.

In the accompanying drawings I have' shown for urposes of illustration one embodiment which my invention may assume in practice. V

In these drawings, 1

Fig. 1 is a view partially in elevation and partially in section showing the front end of a drilling tool provided with the illustrative embodiment of my improved tool retaining means- Fig. 2 is a view taken at rightangles to Fig. 1 and showing parts broken away to disclose details of construction, the retainerbeing shown in operating position in full hnes and in inoperative position in dotted lines. v

In the illustrative embodiment of my invention I have shown the. same arranged upon a percussive motor 1 whose chuck housing and front head enclosing portion 18 lndlcated at 2. Y s

The member 2 is provided at opposite sides with lugs or abutments 3 throu h which bores extend; and through these res the side .rods 5 which serve to hold the parts of the tool in assembled relation are passed. At the front portion of the lugs 4 arcuate seats 6 are milled and in these seats there are arran ed similarly curved projections or bosses 7 w ich serve as journal members for a tool *ainer yoke'8 to which the are herein inxgrally secured. The mem ers 7 are traversed by openings 9 which are of greater area at their extremities than at their central portions. The members 7 are journaled upon H3 the arcuate surfaces 6 and around them at either side passes a yoke member 10 which is Z' ored at 11 to permit the side rods to pass through the same, the legs 10 of these yoke members abutting a ainst the lugs 3. Follower members 12 so bored to permit the side rods to pass therethrou'h and having arcuate surfaces 13 opposite t e arcuatesur- "aces 6 surround each of the side rods and are disposed .between the legs 10 of the yokes 50.. In assembling the device, assume that the side rods and the members 1 and 2 are in vassembled position. The yoke 8 is then placed in position by passing the openings 9 followed by the yokesIO. Thereafter considerably heavier springs 15 are slid into pos tion on the side rods and finally nuts 16 are put on and tightened up at the ends of the side rods. 'After the ends of the legs 10 of the yokes have engaged the abutments 3, further tightening of the nuts 16 cannot increase the tension of the springs 14. Hence further adjustment of the nuts 16 will allow the rods 5 to be brought to any desired tension without influencing operation of the "tool retainer in the least. It will be noted that at the sides of the front of the chuck housing member 2 there are notches cut away as at 17 into which the side elements 18 of the retainer member 8 may snap to hold the same in tool retaining position.

From the foregoingdescri tion the mode of operation of my improve tool retaining means will be readily apparent. When it is desired to insert a tool in position, the retainer yoke 8 will be moved from the position shown in full lines in Fig. 2 to that indicated in dotted lines, this swing being possible by reason of the shape of-the openings 9. When 1t 15 desired to hold a steel in position during retraction from the hole, the retainer will be snapped down from the dotted to. the full line position and by the engagement in the recesses 17 of the side elements 18 of the retainer yoke 8, the parts will be held in tool retaining position. It will be observed that resilience is provided both by the shape of the retainer yoke 8 and more particularly by the light but strong spring 14 which may be comassume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a tool retainer, a pair of tension members adaptedto hold the parts of a drill assembled, a retainer yoke pivoted on said members, springs surrounding said members and adapted when placed'in compression to hold said retainer member in position, a yoke extending on opposite sides of said springs and also carried on said members, heavier springs overlying said members, and means for placing said springs under compression.

2. In a tool retainer mechanism, tension members adapted when under tension to hold the parts of a motor in assembled relation, a tool retainer guided on said members, resilient means coacting with said tool retainer member, a stronger resilient means placed under compression to place said members and resilient means under tension, and stationary means for preventing said second mentioned resilient means from compressing said first mentioned resilient means beyond a predetermined limit.

3. In a drilling mechanism, a member having a pair of lugs formed thereon, rods passing through said lugs, yokes on each of said rods having legs engaging said lugs and providing a free s ace between their legs, means cooperating with said rods for holding said yokes against said lugs, and tool retaining means having portions resiliently located in said spaces. a

4. In a drilling mechanism, a member having a pair of lugs formed thereon, rods passin through said lugs, yokes on each of said r0 5 having legs en 'aglng said lugs and providing a free space between-their legs, means cooperating with said rods for resiliently holding said yokes against said lugs, and tool retaining means having portions resiliently located in said spaces. a

5. In a drilling mechanism,a member having a pair of lugs formed thereon, rods passing through said lugs, yokes on each of said rods having legs en aging said lugs and providing a free space between their legs, means cooperatin with said rods for resiliently holding said yokes against said lugs, pivoted tool retainin means having portions resiliently. locate in said spaces, and means for releasably holding said tool retaining means in tool engaging position.

6. In a drilling mechanism, a pair of members adapted when under tension to hold the parts of the drilling mechanism assembled, lugs through which each of said members pass, a nut on each of said members, a tool retainer yoke pivoted on said members between strength on opposite sides said lugs and nuts, yokes on each of said members surrounding the-pivot portions of said retainer yoke, and springs on opposite Sides of said second-mentioned yokes.

7. In a drilling mechanism, a pair of mem bers adapted when under tension to hold the parts of the drilling mechanism assembled, lugs through which each of said members pass, a nut on each of said members, a tool retainer yoke pivoted on said members between said lugs and nuts, yokes on each of said members surrounding the pivot. portions of said retainer yoke, and springs of different of said secondmentioned yokes.

8. In a drilling mechanism, a pair of mem bers adapted when under tension to hold the parts of the drilling mechanism assembled,

lugs through which each of said-members pass, a nut on each of said members, a tool retainer yoke pivoted on saidmembers between said lugs and nuts, yokes on each of said members surrounding the pivot portions of said retainer yoke, and springs of different strength on opposite sides of said second-men tioned yokes, the compression ofcertain of said springs being determined by the length of said second mentioned yokes.

9. A drilling mechanism ,comprisinga plurality of parts, means for resiliently holding said parts together including tension elements and resilient means for subjecting them to tension, tool retaining means, resilient positioning means for said retaining means, means for tensioning said holding means and compressing said resilient positioning means, and fixed means for limiting the initial compression of said resilient means independently of further tensioning of said holding means.

10. A drilling mechanism comprising a plurality of members, resilient means for holding said members together including a plu rality of tensioned side rods and resilient means associated therewith, 'tool retaining means, resilient positioning means therefor, means for tensioning said rods and compressing said resilient positioning means, and fixed means for limiting the initial compression of said resilient means independently of further tensioning of said rods.

11. A drilling mechanism comprising a plurality of members, resilient means for holdin said members together including a plura ity of tensioned side'rods and springs for tensioning said rods, tool retaining means having portions engagin said rods, resilient positioning means there or, said rod-en aging portions of said retaining means an resihent means bein disposed within the lon- 'tudinal tensione limits of said rods, means or tensioning said rods and compressing said resilient positioning means, and means for limiting the initial compression of said resilient means independently of further tensioning of said rods.

loo

12. In a drilling mechanism, tool retainin means therefor, means including tensione rods for connecting said means to said mechanism, said retaimn means having portions engaging said r0 s, resilient positioning means for said tool retaining means, said resilient means and said rod-enga ing portions of said retainin means being disposed within the longitudinal tensioned limits of said rods, means including springs for tensioning said rods and compressing said resilient means, and fixed means for limiting the initial compression of said resilient means independently of further tensioning of said rods.

13.In a drilling mechanism, tool retaining means therefor, means includin resilient means and side rods for resiliently olding the parts of said drilling mechanism together, resilient positioning means for said retaining means, means for simultaneously tensioning said rods and compressing said resilient positionlng means, and fixed means for limiting the initial compression of said resilient means inggpendently of further tensioning of said to In testimony whereof I afiix my signature.

ELMIER G. GARTIN. 

